求翻译：（1）休伦湖净化水的过程主要是以年为单位来推算出当到达10%的概率，其中，为开始净化水时的污染总数即为3500，根据公式的出为3141.7。依次就可以求出，当时，可以达到所要求的净化水到达10%，因此，当休伦湖的水达到净水的10%时，所需要的时间大致为31年。是什么意思？

正在翻译，请等待...

(1) Houston, lake water-purification process is mainly for years to figure out when it reached 10 per cent of the probability, which, to the Start Purge water pollution total is 3500, in accordance with the formula for the 141.7. Then you can, at that time, you can achieve the required purification

(1) lake huron treated water process mainly is calculated take the year as the unit when arrives 10% probability, among, for starts time the treated water pollution total is 3500, according to the formula is 3141.7.May extract in turn, at that time, might achieve requested the treated water arrived

(1) the Lake Huron water purification process is mainly in years to figure out when you reach the 10% probability, which begun purifying water pollution total is 3500 according to the formula is 3141.7. In turn, you can find the, at that time, can meet the requirements of clean water reaches 10%, so

正在翻译，请等待...